We're dividing 433709 by 91 
The aim is to understand the frequency of 91 in 433709.

On to step 1:
91 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 91

Going ahead to step 2:
When dividing 43 by 91, we get 0 with a remainder of 43.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Grab the next digit (3) from the dividend, add it to 43, then carry on: 433 / 91

Advancing to step 3:
433 divided by 91 is 4 with a remainder of 69.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
The remainder is 69 after subtracting 364 from 433.
Append the next digit (7) from the dividend to 69 and continue with: 697 / 91

Going ahead to step 4:
When dividing 697 by 91, we get 7 with a remainder of 60.
Write down 7 as next digit of the result. 
Result so far: 47.0
Deduct 637 from 697 and we're left with 60.
Append the next digit (0) from the dividend to 60 and continue with: 600 / 91

On to step 5:
If we divide 600 by 91, we get 6 and a remainder of 54.
Write down 6 as next digit of the result. 
Result so far: 476.0
Subtract 546 from 600 to get 54.
Fetch the next digit (9) from the dividend, attach it to 54 and continue: 549 / 91

Going ahead to step 6:
The number 91 fits into 549 6 times, leaving a remainder of 3.
Write down 6 as next digit of the result. 
Result so far: 4766.0
Deduct 546 from 549 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
If we divide 30 by 91, we get 0 and a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 4766.0
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
If we divide 300 by 91, we get 3 and a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 4766.03
Subtract 273 from 300 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 9:
91 goes into 270 2 times with a remainder of 88.
The number 2 becomes the next digit in our result. 
Result so far: 4766.032
If we subtract 182 from 270, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

On to step 10:
When dividing 880 by 91, we get 9 with a remainder of 61.
Use 9 as the next digit of our solution. 
Result so far: 4766.0329
Deduct 819 from 880 and we're left with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Moving on to step 11:
The number 91 fits into 610 6 times, leaving a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 4766.03296
Deduct 546 from 610 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 12:
When dividing 640 by 91, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 4766.032967
Deduct 637 from 640 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 13:
If we divide 30 by 91, we get 0 and a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 4766.032967
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 14:
91 can be fit into 300 3 times, resulting in a remainder of 27.
The number 3 becomes the next digit in our result. 
Result so far: 4766.03296703
Subtract 273 from 300 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The final result is 4766.03296703 with a remainder of 2.7e-08.